Portable test instrument



FIG. 1 is a perspective view of a portable test instrument showing the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a right-side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The portions shown in broken lines depict environmental structure only and do not form part of the claimed design. 

CLAIM The ornamental design for a portable test instrument, as shown and described. 